[Openstack-ansible][cinder-volume] deletion of snapshot after creating a volume from it..

Dear All, Is there a way we can delete a volume who has a snapshot available? I have created a volume from snapshot and now we have a full chain of snapshots and volumes that we can't delete. But I need only the last volume to be available. If not then what is the best use case for snapshot? or Should I assume that if I create a snapshot and then create a volume from that snapshot then I need to keep the old volume and snapshot always. Regards, Danish